| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] about 20 | 44 |
|
| 2 | [adv] about 20 | 33 |
|
| 3 | only about 20 | 17 |
|
| 4 | only about 20 | 17 |
|
| 5 | [adv prt] about 20 | 11 |
|
| 6 | in about 20 | 7 |
|
| 7 | in about 20 | 7 |
|
